岩溶地下水渗流-传热地埋管试验平台的研制及模型试验  

Development and model test of test platform on karst groundwater seepage-heat transfer coupling ground heat exchanger

作　　者：曾召田[1] 刘兆强 徐云山[1,2] 张炳晖 梁珍[1] Zeng Zhaotian;Liu Zhaoqiang;Xu Yunshan;Zhang Binghui;Liang Zhen(Guangxi Key Laboratory of Geotechnical Mechanical and Engineering,Guilin University of Technology,Guilin 541004,China;School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004 [2]福建工程学院土木工程学院,福建福州350118

出　　处：《可再生能源》2022年第9期1173-1180,共8页Renewable Energy Resources

基　　金：国家自然科学基金(41962014,51568014);广西自然科学基金项目(2018GXNSFAA138182)。

摘　　要：文章建立了岩溶地下水渗流-传热地埋管试验平台,可有效模拟岩溶地区地埋管换热过程中土壤温度场、湿度场、渗流场共同作用的多场环境,并利用该模型装置进行了不同工况的模型试验,探讨了岩溶地下水渗流对地埋管换热性能的影响规律。研究结果表明:渗流速度为1.08×10m/s时,渗流作用使得地埋管换热量平均提升了约12.5%,地埋管与土层间的换热速度提升约90%;岩溶地下水渗流将上游热量携带至下游,促进了地埋管释放的热量向下游传递的同时,也抑制了热量向上游的传递,有效减弱了地埋管周围土层的热量堆积;随着渗流速度的增加,岩溶地下水渗流对地埋管换热性能的影响越显著。A test platform for coupled percolation and heat transfer of karst groundwater was established.On this basis,the influence of karst groundwater seepage on the heat transfer performance of ground heat exchanger(GHE)was discussed through model tests under different working conditions.The results show that the platform can effectively simulate the multi-field coupling environment of soil temperature field,humidity field and seepage field in the process of GHE heat transfer in karst area.In order to investigate the influence of Karst groundwater seepage on the heat transfer performance of GHE,the model tests under different working conditions were carried out by using the model device.The results show that when the seepage velocity is 1.08×10-5m/s,the average heat transfer of GHE increases by 12.5%,and the heat transfer rate between buried pipe and soil layer increases by 90%;Karst groundwater seepage carries the heat from the upstream to the downstream,which promotes the transfer of heat from the GHE to the downstream,but also inhibits the transfer of heat to the upstream,effectively weakening the heat accumulation in the soil around the GHE;With the increase of seepage velocity,the influence of karst groundwater seepage on the heat transfer performance of GHE is more significant.

关 键 词：土壤源热泵 岩溶地区 地下水渗流 传热性能 模型试验 

分 类 号：TK529[动力工程及工程热物理—热能工程]